David Smith is battling ACC for his sanity after a treatment which he says injured his neck and left him with a continuous, high-frequency whining in his ears.
"It has been psychologically devastating," Mr Smith said yesterday of his tinnitus, a poorly understood condition in which the noise is produced by something in the head rather than external sound waves.
The 54-year-old from Levin is on an invalid's benefit, unable to work, and takes a sedative drug to help him sleep and cope with the anxiety caused by the intolerable noise.
ACC says Mr Smith's claim was assessed by a neurologist and an ear-nose-throat specialist/head and neck surgeon, who found no evidence he suffered an injury as a result of chiropractic treatment in October 2006.
Mr Smith had gone to a chiropractor for pain treatment and his neck was manipulated.